netfilter: nft_limit: fix packet ratelimiting

Credit calculations for the packet ratelimiting are not correct, as per
the applied ratelimit of 25/second and burst 8, a total of 33 packets
should have been accepted.  This is true in iptables(33) but not in
nftables (~65). For packet ratelimiting, use:

	div_u64(limit->nsecs, limit->rate) * limit->burst;

to calculate credit, just like in iptables' xt_limit does.

Moreover, use default burst in iptables, users are expecting similar
behaviour.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_limit.c

@@ -51,10 +51,13 @@ static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
  return !limit->invert;
 }
 
+/* Use same default as in iptables. */
+#define NFT_LIMIT_PKT_BURST_DEFAULT 5
+
 static int nft_limit_init(struct nft_limit *limit,
- const struct nlattr * const tb[])
+ const struct nlattr * const tb[], bool pkts)
 {
- u64 unit;
+ u64 unit, tokens;
 
  if (tb[NFTA_LIMIT_RATE] == NULL ||
  tb[NFTA_LIMIT_UNIT] == NULL)
@@ -68,18 +71,25 @@ static int nft_limit_init(struct nft_limit *limit,
 
  if (tb[NFTA_LIMIT_BURST])
  limit->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));
- else
- limit->burst = 0;
+
+ if (pkts && limit->burst == 0)
+ limit->burst = NFT_LIMIT_PKT_BURST_DEFAULT;
 
  if (limit->rate + limit->burst < limit->rate)
  return -EOVERFLOW;
 
- /* The token bucket size limits the number of tokens can be
- * accumulated. tokens_max specifies the bucket size.
- * tokens_max = unit * (rate + burst) / rate.
- */
- limit->tokens = div_u64(limit->nsecs * (limit->rate + limit->burst),
- limit->rate);
+ if (pkts) {
+ tokens = div_u64(limit->nsecs, limit->rate) * limit->burst;
+ } else {
+ /* The token bucket size limits the number of tokens can be
+ * accumulated. tokens_max specifies the bucket size.
+ * tokens_max = unit * (rate + burst) / rate.
+ */
+ tokens = div_u64(limit->nsecs * (limit->rate + limit->burst),
+ limit->rate);
+ }
+
+ limit->tokens = tokens;
  limit->tokens_max = limit->tokens;
 
  if (tb[NFTA_LIMIT_FLAGS]) {
@@ -144,7 +154,7 @@ static int nft_limit_pkts_init(const struct nft_ctx *ctx,
  struct nft_limit_pkts *priv = nft_expr_priv(expr);
  int err;
 
- err = nft_limit_init(&priv->limit, tb);
+ err = nft_limit_init(&priv->limit, tb, true);
  if (err < 0)
  return err;
 
@@ -185,7 +195,7 @@ static int nft_limit_bytes_init(const struct nft_ctx *ctx,
 {
  struct nft_limit *priv = nft_expr_priv(expr);
 
- return nft_limit_init(priv, tb);
+ return nft_limit_init(priv, tb, false);
 }
 
 static int nft_limit_bytes_dump(struct sk_buff *skb,
@@ -246,7 +256,7 @@ static int nft_limit_obj_pkts_init(const struct nft_ctx *ctx,
  struct nft_limit_pkts *priv = nft_obj_data(obj);
  int err;
 
- err = nft_limit_init(&priv->limit, tb);
+ err = nft_limit_init(&priv->limit, tb, true);
  if (err < 0)
  return err;
 
@@ -289,7 +299,7 @@ static int nft_limit_obj_bytes_init(const struct nft_ctx *ctx,
 {
  struct nft_limit *priv = nft_obj_data(obj);
 
- return nft_limit_init(priv, tb);
+ return nft_limit_init(priv, tb, false);
 }
 
 static int nft_limit_obj_bytes_dump(struct sk_buff *skb,